Andrew Bacevich (1947- ). Research material regarding Bacevich's book Diplomat in Khaki: Major General Frank Ross McCoy and American Foreign Policy, 1898-1949 (University Press of Kansas, 1989), from the recognized U.S. Army Colonel and author.

Eric Clark (1937- ). Manuscripts, correspondence, and other items from the author of Diplomat: The World of International Diplomacy (Taplinger, 1973).

Hermann F. Eilts (1922-2006). Manuscripts, correspondence, research material, and more, from the career diplomat, U.S. Foreign Service officer, and Ambassador to Saudi Arabia (1965-1970), Bangladesh (1972-1973), and Egypt (1974-1979).

George Feldman (1904-1994). Manuscripts, correspondence, photographs, and other items from the U.S. Ambassador to Malta and Luxembourg (1965-1967).

William R. Frye (1918-1993). Manuscripts, photographs, and other material, from the longtime United Nations correspondent for the Christian Science Monitor and author of the influential book A United Nations Peace Force (Oceana Publications, 1957).

Waldemar J. Gallman (1899-1980). Manuscripts, correspondence, photographs, and other items from the U.S. Ambassador to Poland (1948-1950), South Africa (1951-1954), Iraq (1954), and Director General of the U.S. Foreign Service (1958-1961).

Ralph Isaac Ingersoll (1789-1872). Diaries and a scrapbook kept during his tenure as U.S. Minister Plenipotentiary to the Imperial Court of Russia (1847-1849) as well as his son, Colin Macrae Ingersoll's, diaries and scrapbook describing the same time (and other journeys through Europe); diplomatic memorabilia used by Ralph Isaac Ingersoll while at the Russian court. In the Ralph Ingersoll Collection.

George Pratt Ingersoll (1861-1927). Scrapbooks and a photo album regarding his tenure as the U.S. Minister Plenipotentiary to Siam (now Thailand), 1917-ca. 1920; as well as his daughter Gertrude V. Ingersoll's diary regarding her father's time as a diplomat in Siam. In the Ralph Ingersoll Collection.

Countess Catherine (1889-1985) and Count Michael (1875-1955) Karolyi. Manuscripts, correspondence, and other items from these two members of the Hungarian aristocracy; Count Karolyi served as the Hungarian ambassador to France after World War II.

Henry Kissinger (1923- ). Several letters from the influential and controversial diplomat and political advisor. In various collections.

John W. McCormack (1891-1980). Numerous letters to and from the U.S. State Department, dating from the 1950s and 1960s; from the papers of the Representative from Massachusetts (1928-1971) and Speaker of the U.S. House of Representatives (1962-1971).

William V. Shannon (1927-1988). Manuscripts, correspondence, subject files, and other items from the journalist, author, and U.S. Ambassador to Ireland (1977-1980).

Clare Timberlake (1907-1982). Manuscripts, correspondence, scrapbooks, photographs, and various other documents from the career of this U.S. Foreign Service officer and Ambassador to the Congo (1960-1961).

Clifton Wharton (1899-1990). Scrapbooks, documents, photographs, and other items regarding this groundbreaking diplomat - the first African-American chief of a diplomatic mission to a European nation.

Faith R. Whittlesey (1939- ). Correspondence, diaries, professional files, scrapbooks, photographs, audio, video, and other material from the prominent New York State Republican and former U.S. Ambassador to Switzerland (1981-1983, 1985-1988).

William Yale (1887-1975). Manuscripts, correspondence, research material, and other papers from the renowned author, scholar, diplomat, and U.S. government advisor on the Middle East.